High Density Calcium Silicate Board 1020 kg/m³ for Molten Aluminum Contact

Why It Is the Preferred Material for Aluminum Melting & Holding Furnaces

As aluminum producers continue to pursue lower energy consumption, cleaner molten metal transfer, and longer furnace service life, material selection inside the hot zone becomes increasingly important. Conventional insulation boards often cannot survive direct molten aluminum contact due to metal penetration, thermal shock, or insufficient structural strength.

High Density Calcium Silicate Board 1020 kg/m³ was developed specifically for these demanding conditions. Combining high mechanical strength, thermal insulation efficiency, and resistance to molten aluminum wetting, it has become a preferred solution for aluminum melting, holding, transfer, and casting systems.

What Is High Density Calcium Silicate Board 1020 kg/m³?

High density calcium silicate board is an asbestos-free thermal insulation and structural material produced from hydrous calcium silicate and engineered into compressed boards with densities from 800–1200 kg/m³. The 1020 kg/m³ grade sits in the premium range designed for applications where both insulation and mechanical loading are required.

Unlike standard lightweight insulation boards (220–500 kg/m³), this grade is intended to:

1. Resist molten metal contact
2. Maintain dimensional stability
3. Carry structural load
4. Improve thermal efficiency
5. Extend maintenance intervals

Why Aluminum Furnaces Require 1020 Density Instead of Standard Insulation

Inside aluminum furnaces and launders, materials experience:

1. Operating temperatures around 700–850°C
2. Continuous exposure to molten aluminum
3. Rapid heating and cooling cycles
4. Mechanical stress during maintenance and operation

Under these conditions, ordinary insulation materials may crack, deform, or absorb molten aluminum.

The 1020 kg/m³ grade provides the balance between insulation and durability needed for long-term operation.

Key Advantages of 1020 kg/m³ High Density Calcium Silicate Board

1. Suitable for Molten Aluminum Contact

This grade is specifically promoted for molten aluminum contact applications, especially in launders and transfer areas. Its dense structure helps reduce metal penetration and improves operational cleanliness.

2. High Mechanical Strength

Compared with standard insulation boards, the 1020 grade offers significantly improved compressive performance and dimensional stability under load. This allows use in components exposed to pressure and thermal cycling.

3. Reduced Heat Loss

The board limits thermal transfer and helps maintain stable molten aluminum temperatures.

Benefits include:

1. Lower energy consumption
2. Faster thermal stabilization
3. Improved furnace efficiency

4. Excellent Machinability

Boards can be CNC machined into custom shapes and components.

Typical fabricated parts include:

1. Launder covers
2. Flow tubes
3. Transfer plates
4. Dams
5. Spouts
6. Custom furnace insulation components

Typical Applications

High Density Calcium Silicate Board 1020 kg/m³ is commonly used for:

1. Aluminum melting furnaces
2. Aluminum holding furnaces
3. Molten aluminum launders
4. Transfer trough systems
5. Flow control blocks
6. Spouts and nozzles
7. Furnace insulation structures
8. Non-ferrous metal processing equipment

Typical Technical Data

Values may vary by production method and specification.

Installation Recommendations

For best service life:

1. Store boards in dry conditions
2. Avoid rapid heating during startup
3. Preheat before direct molten metal exposure
4. Ensure clean and stable support surfaces
5. Follow gradual commissioning procedures

These practices help reduce thermal stress and improve long-term performance.

Conclusion

For aluminum melting and transfer systems where direct contact with molten aluminum is unavoidable, High Density Calcium Silicate Board 1020 kg/m³ offers an effective combination of insulation performance, structural reliability, and resistance to harsh thermal conditions.

Compared with ordinary insulation boards, it delivers longer service life, cleaner molten metal handling, lower heat loss, and improved production efficiency, making it one of the preferred solutions for modern aluminum processing plants.